Logger not configured when JAR is started

[koppor]

When starting the JAR of JabRef, following output appears:

ERROR StatusLogger Unrecognized format specifier [d]

Steps to reproduce:

1. gradlew shadowJar
2. java -jar build\libs\JabRef-3.3dev-fat.jar

[simonharrer]

Problem of log4j2 in fat jars. Cannot be resolved easily. Maybe switch back to log4j v1?

[koppor]

Do you have a link for it? The stackoverflow answer at http://stackoverflow.com/a/34149368/873282 suggests that we might be using a wrong XML configuration.

OK, JIRA-LOG4J2-954 suggests that we should downgrade to 2.0.2.

As log4j v1 reached its end of life August 2015, I would suggest to try to get log4j v2 running or switch to Logback ^^.

[simonharrer]

Commons-logging does not work well with logback.

Root issue: http://stackoverflow.com/questions/34945438/log4j2-configuration-not-found-when-running-standalone-application-builded-by-sh/34946780

Solution in the maven world https://github.com/edwgiz/maven-shaded-log4j-transformer

[simonharrer]

206ba3f

[ghost]

Still present in 5.0's "Portable Linux" .

Java:

openjdk version "1.8.0_252"
OpenJDK Runtime Environment (IcedTea 3.16.0) (Slackware)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)